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Old 1st December 2015, 11:11 AM
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Tench Tench is offline
WHFTA World Champion 2016.
Join Date: Sep 2009
Location: derby
Posts: 1,429

The gyroscopic stability of a pellet created by the twist rate has an effect on the pellets resistance to be deflected by external forces, wind and gravity. This is the principle of a rifled barrel. Changes in the twist rate can give the impression of a different bc without actually changing the bc. But the bc can be affected by a multitude of variables, inc;

Barrel length
port area
port length
valve duration
reg pressure
reg volume
hammer spring preload
hammer weight

I have also found that a twist rate can suit one pellet and not another, with some undesirable effects (magnus) occurring with certain combinations. Centre fire shooters are very aware of the need to match the two.

I have spent some time with this over the years , there are benefits to be had!
HFT, for people with only 2 buttucks!

VooDoo TwoTwo The next chapter.

Last edited by Tench; 1st December 2015 at 11:21 AM.
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